Light emitting panel assemblies

US 5,613,751 A
Filed: 06/27/1995
Issued: 03/25/1997
Est. Priority Date: 06/27/1995
Status: Expired due to Term

First Claim

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1. A light emitting panel assembly comprising a light emitting panel member having a light emitting surface, a light transition area, and a light source embedded or potted in said light transition area so as to eliminate any air interface between said light source and said light transition area.

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Abstract

Light emitting panel assemblies include light emitting panel members and one or more light sources positioned/embedded in a light transition area, which increases the efficiency of light entering the panel members along the light input area to be emitted from one or more light emitting surfaces along the length of the panel members. Light may be reflected or refracted by a surface which changes the path of a portion of light such that it enters the input area of the panel member at a more acceptable angle. A uniform light output distribution may be produced by utilizing a pattern of light extracting deformities.

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97 Claims

1. A light emitting panel assembly comprising a light emitting panel member having a light emitting surface, a light transition area, and a light source embedded or potted in said light transition area so as to eliminate any air interface between said light source and said light transition area.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95)
- - 2. The assembly of claim 1 further comprising a pattern of light extracting deformities on said panel member for providing a desired light output distribution.
  - 3. The assembly of claim 2 wherein said pattern of light extracting deformities comprises a plurality of deformities, each having an area of no more than approximately 0.006 square inch.
  - 4. The assembly of claim 3 wherein said plurality of deformities vary along the length of said light emitting surface.
  - 5. The assembly of claim 3 wherein said plurality of deformities vary along the width of said light emitting surface.
  - 6. The assembly of claim 3 wherein said plurality of deformities vary along the width and length of said light emitting surface.
  - 7. The assembly of claim 2 further comprising an end reflector at an end of said panel member remote from said light source, said pattern of light extracting deformities varying to compensate for light reflected back within said panel member by said end reflector.
  - 8. The assembly of claim 2 further comprising a film for diffusing the light output distribution from said light emitting surface.
  - 9. The assembly of claim 2 wherein said pattern of light extracting deformities vary to compensate for a diffuser, lens, prismatic surface, label, overlay, colored film, or polarizer used with said panel member.
  - 10. The assembly of claim 2 wherein said deformities comprise prismatic surfaces, raised surfaces or depressions formed in said panel member.
  - 11. The assembly of claim 2 wherein said deformities comprise prismatic surfaces formed on an exterior surface of said panel member.
  - 12. The assembly of claim 1 further comprising a film for diffusing the light output distribution from said panel member, said film being attached to said panel member around a peripheral edge of said panel member, leaving an air gap between said panel member and said film.
  - 13. The assembly of claim 1 further comprising a reflector for reflecting light emitted from said panel member back through said panel member, said reflector being attached to said panel member around a peripheral edge of said panel member, leaving an air gap between said panel member and said reflector.
  - 14. The assembly of claim 1 wherein said light source is a light emitting diode.
  - 15. The assembly of claim 1 wherein said light source is an incandescent light.
  - 16. The assembly of claim 1 wherein said light source comprises multicolored lights for providing a colored light output distribution.
  - 17. The assembly of claim 1 wherein said panel member includes posts to provide structural support for a display panel to be backlighted by said panel assembly.
  - 18. The assembly of claim 1 wherein said light source is mounted in a recess, slot or cavity in said light transition area, said recess, slot or cavity being filled with a transparent medium to eliminate any such air interface between said light source and said light transition area.
  - 19. The assembly of claim 1 further comprising a tray for said panel member, said tray providing a back reflector for said panel member.
  - 20. The assembly of claim 19 wherein said tray includes reflective surfaces behind and around said light source.
  - 21. The assembly of claim 19 wherein said panel member has a plurality of light emitting surfaces, said assembly having a secondary reflector for reflecting a portion of the light entering said panel member from said light source to one or more of said light emitting surfaces.
  - 22. The assembly of claim 19 wherein said tray acts as an end reflector.
  - 23. The assembly of claim 1 wherein said panel member includes a plurality of said light transition areas at one or both ends of said panel member, and at least light source embedded or potted in each of said light transition areas so as to eliminate any such air interface between each said light source and said light transition areas.
  - 24. The assembly of claim 23 wherein each of said light transition areas includes a plurality of lights.
  - 25. The assembly of claim 1 wherein said panel member includes a structural support for an LCD.
  - 26. The assembly of claim 1 wherein said panel member has a plurality of cavities which allow for the insertion of modular components into said panel member.
  - 27. The assembly of claim 1 further comprising a recess in said panel member, said light transition area comprising an insert shaped for receipt in said recess in a modular manner for easy placement of said light source in said panel member.
  - 28. The assembly of claim 1 wherein said light transition area has an axis that is offset from an axis of said panel member.
  - 29. The assembly of claim 1 wherein said light transition area has a surface for collecting a portion of the light in more than one plane and redirecting a portion of the light into said panel member.
  - 30. The assembly of claim 1 wherein a plurality of light sources are mounted in said light transition area, said light sources being oriented at different angles relative to each other to facilitate mixing of the light in said light transition area.
  - 31. The assembly of claim 1 wherein said light transition area and said panel member are angularly oriented relative to each other.
  - 32. The assembly of claim 31 further comprising a reflective surface at a junction between said light transition area and said panel member for reflecting light received from said light transition area through said panel member.
  - 33. The assembly of claim 1 further comprising a film for changing the color of the light output distribution from said light emitting surface.
  - 34. The assembly of claim 1 wherein said panel member has a plurality of light emitting surfaces.
  - 35. The assembly of claim 1 wherein said panel member has a secondary reflective or refractive surface for redirecting a portion of the light within said panel member.
  - 36. The assembly of claim 1 wherein said panel member has a plurality of secondary reflective or refractive surfaces to redirect a portion of the light within said panel member.
  - 37. The assembly of claim 1 wherein said panel member has a prism end reflector remote from said light source.
  - 38. The assembly of claim 1 wherein said panel member has a tapered end reflector remote from said light source.
  - 39. The assembly of claim 1 wherein said light transition area is dimensionally thicker than said panel member.
  - 40. The assembly of claim 39 wherein said light source is dimensionally thicker than said panel member.
  - 41. The assembly of claim 39 wherein said light transition area has a surface for redirecting a portion of the light emitted from said light source into said panel member at a relatively low angle.
  - 42. The assembly of claim 1 wherein said panel member has a thickness of 0.125 inch or less.
  - 43. The assembly of claim 1 wherein said light transition area includes a slot or recess in which said light source is received.
  - 44. The assembly of claim 43 wherein said light source and said light transition area include locating surfaces for locating said light source in said slot or recess.
  - 45. The assembly of claim 44 wherein said locating surfaces comprise tabs on said light source and correspondingly shaped recesses in said light transition area which receive said tabs on said light source.
  - 46. The assembly of claim 43 wherein said slot or recess is in a back edge of said light transition area, said light source being slidably received into said slot or recess from said back edge.
  - 47. The assembly of claim 43 wherein said light source has a snap fit in said slot or recess.
  - 48. The assembly of claim 1 wherein said light transition area includes surfaces having multiple or three-dimensional shapes that collect a portion of the light and redirect the collected light into said panel member.
  - 49. The assembly of claim 1 wherein said light transition area includes surfaces for collecting a portion of the light in more than one plane and redirecting the collected light into said panel member.
  - 50. The assembly of claim 1 wherein said panel member includes light extracting deformities for providing a desired light output distribution from said panel member, said panel member and said deformities being transparent, whereby said panel assembly may be used to front light a display.
  - 51. The assembly of claim 1 wherein light from a secondary light source projects through said panel member for indication or some other effect.
  - 52. The assembly of claim 1 further comprising a coating of a pattern of light extracting deformities on said panel member, said light extracting deformities having a density concentration for causing a substantially uniform light output distribution from one of said surfaces of said panel member.
  - 53. The assembly of claim 52 wherein said coating of light extracting deformities varies in density along the length and/or width of one of said panel member surfaces.
  - 54. The assembly of claim 52 wherein said pattern of light extracting deformities comprises a plurality of deformities, each having an area of approximately 0.006 square inch or less.
  - 55. The assembly of claim 52 wherein said pattern of light extracting deformities are printed on a film.
  - 56. The assembly of claim 55 wherein said film is attached to said panel member.
  - 57. The assembly of claim 52 wherein said panel member has one or more cavities for receipt of modular components in said panel member.
  - 58. The assembly of claim 52 further comprising a recess in said panel member, said light transition area comprising an insert shaped for receipt in said recess in a modular manner for easy placement of said light source in said panel member.
  - 59. The assembly of claim 58 wherein said insert has a reflective surface around and behind said light source.
  - 60. The assembly of claim 52 wherein a plurality of said light sources are embedded in said light transition area.
  - 61. The assembly of claim 60 wherein said light sources are oriented at different angles relative to each other to facilitate mixing of the light in said light transition area.
  - 62. The assembly of claim 52 wherein said light transition area and said panel member are angularly oriented relative to each other.
  - 63. The assembly of claim 52 wherein said light source comprises multiple colored lights for supplying light to said light transition area, said light transition area providing a colored light output distribution to said panel member.
  - 64. The assembly of claim 63 wherein said colored light output distribution is mixed to produce white light.
  - 65. The assembly of claim 52 wherein said light source comprises multiple colored lights for providing a colored light output distribution.
  - 66. The assembly of claim 52 wherein said light extracting deformities vary in shape.
  - 67. The assembly of claim 52 wherein said light extracting deformities vary in size.
  - 68. The assembly of claim 52 wherein said light extracting deformities vary in color.
  - 69. The assembly of claim 52 wherein said light extracting deformities vary in color to provide different colored light output areas on said panel member.
  - 70. The assembly of claim 52 wherein said light extracting deformities vary in index of refraction.
  - 71. The assembly of claim 52 wherein there are multiple layers of said light extracting deformities on said light emitting surface.
  - 72. The assembly of claim 52 wherein said light extracting deformities vary along the length and/or width of said panel member.
  - 73. The assembly of claim 52 wherein said light extracting deformities vary in percent of coverage along the length and/or width of said panel member.
  - 74. The assembly of claim 52 wherein said pattern of light extracting deformities are printed on a film.
  - 75. The assembly of claim 74 wherein said film is attached to said panel member.
  - 76. The assembly of claim 52 wherein said light extracting deformities are shaped with no specific angles.
  - 77. The assembly of claim 76 wherein said light extracting deformities are printed on said panel member.
  - 78. The assembly of claim 76 wherein said light extracting deformities are molded in said panel member.
  - 79. The assembly of claim 76 wherein said light extracting deformities are molded on an exterior surface of said panel member.
  - 80. The assembly of claim 52 wherein said light extracting deformities are printed on said panel member using stochastic print pattern techniques.
  - 81. The assembly of claim 52 wherein said light extracting deformities are printed on said panel member using frequency modulated half tone patterns.
  - 82. The assembly of claim 52 wherein said light extracting deformities are printed on said panel member using random dot half tones.
  - 83. The assembly of claim 1 further comprising at least one reflective surface on said light transition area in close proximity to said light source for causing internal reflection of a portion of the light emitted from said light source back through said light transition area and into said panel member at an acceptable angle.
  - 84. The assembly of claim 83 wherein said reflective surface is located on said light transition area on opposite sides of said light source.
  - 85. The assembly of claim 1 wherein said panel member has a light input surface at one end for receiving light from said light transition area, and said light transition area has a reflective surface shaped to cause internal reflection of a portion of the light emitted from said light source and redirect the internally reflected light into said one end of said panel member to produce a more uniform density of light across substantially the entire cross sectional area of said light input surface.
  - 86. The assembly of claim 1 wherein said light source is insert molded or cast within said light transition area.
  - 87. The assembly of claim 1 wherein said panel member includes a structural support for an LCD.
  - 88. The assembly of claim 1 wherein said panel member is relatively thin and flat and has opposite ends and sides and top and bottom surfaces, said light transition area being located at one of said ends, said light source comprising multiple colored lights, the light from said multiple colored lights being mixed within said light transition area to produce a desired color of light, and a pattern of light extracting deformities on said panel member for providing a desired light output distribution from one of said surfaces.
  - 89. The assembly of claim 88 further comprising at least one reflective surface on said light transition area in close proximity to said light source for causing a portion of the light emitted from said light source to be internally reflected to produce a more uniform density of light across substantially the entire cross sectional area of said one end of said member.
  - 90. The assembly of claim 88 wherein said light source comprises two or more colored LEDs or a single LED with multiple colored chips.
  - 91. The assembly of claim 88 wherein said multiple colored lights are oriented at different angles relative to each other to facilitate mixing of the light in said light transition area.
  - 92. The assembly of claim 88 further comprising a reflective surface on said light transition area for aiding in mixing the light from said multiple colored lights.
  - 93. The assembly of claim 88 wherein the light from said multiple colored lights is mixed within said light transition area to produce substantially white light which is conducted into said one end of said panel member.
  - 94. The assembly of claim 1 wherein said panel member is relatively thin and flat and has opposite ends and sides and top and bottom surfaces and a light input surface area at one end for receiving light from said light transition area, said light transition area having at least one reflective surface in close proximity to said light source shaped to redirect a portion of the light emitted from said light source at a relatively low ray angle distribution, whereby said panel member may be made thinner and longer than would otherwise be possible and still obtain a substantially uniform light output distribution from one of said sides of said panel member over substantially the entire surface of said panel member when illuminated from said one end only.
  - 95. The assembly of claim 1 wherein said panel member provides light for an LCD and/or switch.

96. A light emitting panel assembly comprising a light emitting panel member having a light extracting surface, a light transition area, and a light source bonded to said light transition area so as to eliminate any air interface between said light source and said light transition area.
- View Dependent Claims (97)
- - 97. The assembly of claim 96 wherein said light transition area includes a slot or recess in which said light source is received, said light source and said light transition area including mating surfaces for locating said light source in said slot or recess.

Specification

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Litigation Campaign Assessment

Current Assignee
Innovative Display Technologies LLC (Acacia Research Corporation)
Original Assignee
Lumitex Incorporated
Inventors
Kelsch, Daniel N., Parker, Jeffery R., Miller, Mark D.
Primary Examiner(s)
Lazarus, Ira S.
Assistant Examiner(s)
Basichas, Alfred

Application Number

US08/495,176
Time in Patent Office

637 Days
Field of Search

362/26, 362/27, 362/31, 362/235, 362/249, 362/297, 362/299, 362/300, 362/308, 362/329, 362/330, 362/346, 362/800
US Class Current

362/627
CPC Class Codes

A61B 2090/309   using white LEDs

G02B 6/0018   Redirecting means on the su...

G02B 6/0021   for housing at least a part...

G02B 6/0028   Light guide, e.g. taper

G02B 6/0031   Reflecting element, sheet o...

G02B 6/0036   2-D arrangement of prisms, ...

G02B 6/0038   Linear indentations or groo...

G02B 6/0043   provided on the surface of ...

G02B 6/0068   Arrangements of plural sour...

H01H 2219/062   Light conductor

H01H 2221/07   transparent

Y10S 362/80   Light emitting diode

Light emitting panel assemblies

First Claim

11 Assignments

0 Petitions

Accused Products

Abstract

419 Citations

97 Claims

Specification

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Light emitting panel assemblies

First Claim

11 Assignments

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0 Petitions

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Accused Products

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Abstract

419 Citations

97 Claims

Specification

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Solutions

Use Cases

Quick Links